toggle_dot_files.sh

#!/usr/bin/env bash
STATUS=`defaults read com.apple.finder AppleShowAllFiles 2>/dev/null`
if [ "$STATUS" == TRUE ]; then
  STATUS=`osascript -e 'tell app "Finder" to display alert "Finder is showing hidden files." buttons {"Cancel", "Hide"}'`
else
  STATUS=`osascript -e 'tell app "Finder" to display alert "Finder is not showing hidden files." buttons {"Cancel", "Show"}'`
fi
if [ "$STATUS" == "button returned:Show" ]; then
  defaults write com.apple.finder AppleShowAllFiles TRUE
  killall Finder
elif [ "$STATUS" == "button returned:Hide" ]; then
  defaults write com.apple.finder AppleShowAllFiles FALSE
  killall Finder
fi